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A simple pendulum is suspended from the roof of a train. If the train is moving with an acceleration of 49 cm/s2 , then the angle of inclination of the string about the vertical will be ____.

a) 20°

b) 0°

c) 30°

d) 3°

from maharashtra board physics
in physics
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pseudo force=ma

gravity=mg

tan$$\theta = {ma\over mg }$$

$$\theta = tan^{-1}({ma\over mg})$$

$$=tan^{-1}({ 0.49\over 9.8})$$

$$=tan^{-1}(0.05)$$

=$$3 ^o$$

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